Method for screen unlocking, method for image acquiring, and electronic terminal

  • US 10,346,597 B2
  • Filed: 05/24/2018
  • Issued: 07/09/2019
  • Est. Priority Date: 03/16/2016
  • Status: Active Grant
First Claim
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1. A computer-implemented method, using at least one hardware processor, for screen unlocking of an electronic terminal, comprising:

  • counting recorded debug parameters used for selecting target fingerprint images in a most recent N instances, wherein N is a natural number and the debug parameters comprise capacity auto control (CAC) parameters, wherein the CAC parameters comprise at least one of a gain of an analog-to-digital converter (ADC), an offset of the ADC, or a pixel gain, wherein the debug parameters for an instance of the most recent N instances are adjusted for several times when the electronic terminal acquires a fingerprint image, wherein the fingerprint image is processed with the debug parameters adjusted each time to obtain processed fingerprint images, wherein selecting a target fingerprint image for the instance comprises selecting one of the processed fingerprint images having a highest clarity;

    ranking the recorded debug parameters in a descending order according to frequencies of use of the recorded debug parameters;

    determining a most frequently used debug parameter from the ranked recorded debug parameters;

    performing, by the at least one hardware processor, auto-adjustment on current debug parameters based on the most frequently used debug parameter;

    after performing the auto-adjustment, obtaining debugged images by debugging a current image acquired with the current debug parameters;

    selecting, from among the debugged images, a new target image having a highest clarity of the debugged images; and

    unlocking a screen of the electronic terminal when the new target image satisfies an unlocking condition.

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